“What are some symptoms of vitamin B1 deficiency? A thiamine deficiency (also referred to as beriberi) can cause weakness, chronic fatigue, heart complications, psychosis and nerve damage. The best way to prevent thiamine deficiency is to eat whole foods that supply high amounts of B vitamins, particularly thiamine foods. Thiamine can be found in many commonly eaten foods, including certain whole grains, beans, nuts, nutritional yeast, organ meats like liver and other meats. Additionally, it is included in many vitamin B complex supplement products, which is good news in preventing a thiamine deficiency….” Click Thiamine Deficiency Symptoms & Dangers You Don’t Want to Ignore for the rest of the article.